[ntk/apt.git] / methods / mirror.cc

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: mirror.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $
/* ######################################################################

   Mirror Aquire Method - This is the Mirror aquire method for APT.
   
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <apt-pkg/fileutl.h>
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/acquire-item.h>
#include <apt-pkg/acquire.h>
#include <apt-pkg/error.h>
#include <apt-pkg/hashes.h>
#include <apt-pkg/sourcelist.h>

#include <fstream>
#include <iostream>
#include <stdarg.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>

using namespace std;

#include "mirror.h"
#include "http.h"
#include "apti18n.h"
									/*}}}*/

/* Done:
 * - works with http (only!)
 * - always picks the first mirror from the list
 * - call out to problem reporting script
 * - supports "deb mirror://host/path/to/mirror-list/// dist component"
 * - uses pkgAcqMethod::FailReason() to have a string representation
 *   of the failure that is also send to LP
 * 
 * TODO: 
 * - deal with runing as non-root because we can't write to the lists 
     dir then -> use the cached mirror file
 * - better method to download than having a pkgAcquire interface here
 *   and better error handling there!
 * - support more than http
 * - testing :)
 */

MirrorMethod::MirrorMethod()
   : HttpMethod(), DownloadedMirrorFile(false)
{
};

// HttpMethod::Configuration - Handle a configuration message		/*{{{*/
// ---------------------------------------------------------------------
/* We stash the desired pipeline depth */
bool MirrorMethod::Configuration(string Message)
{
   if (pkgAcqMethod::Configuration(Message) == false)
      return false;
   Debug = _config->FindB("Debug::Acquire::mirror",false);
   
   return true;
}
									/*}}}*/

// clean the mirrors dir based on ttl information
bool MirrorMethod::Clean(string Dir)
{
   vector<metaIndex *>::const_iterator I;

   if(Debug)
      clog << "MirrorMethod::Clean(): " << Dir << endl;

   if(Dir == "/")
      return _error->Error("will not clean: '/'");

   // read sources.list
   pkgSourceList list;
   list.ReadMainList();

   DIR *D = opendir(Dir.c_str());   
   if (D == 0)
      return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
   
   string StartDir = SafeGetCWD();
   if (chdir(Dir.c_str()) != 0)
   {
      closedir(D);
      return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
   }
   
   for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
   {
      // Skip some files..
      if (strcmp(Dir->d_name,"lock") == 0 ||
	  strcmp(Dir->d_name,"partial") == 0 ||
	  strcmp(Dir->d_name,".") == 0 ||
	  strcmp(Dir->d_name,"..") == 0)
	 continue;

      // see if we have that uri
      for(I=list.begin(); I != list.end(); I++)
      {
	 string uri = (*I)->GetURI();
	 if(uri.substr(0,strlen("mirror://")) != string("mirror://"))
	    continue;
	 string BaseUri = uri.substr(0,uri.size()-1);
	 if (URItoFileName(BaseUri) == Dir->d_name)
	    break;
      }
      // nothing found, nuke it
      if (I == list.end())
	 unlink(Dir->d_name);
   };
   
   chdir(StartDir.c_str());
   closedir(D);
   return true;   
}


bool MirrorMethod::DownloadMirrorFile(string mirror_uri_str)
{

   // check the file, if it is not older than RefreshInterval just use it
   // otherwise try to get a new one
   if(FileExists(MirrorFile)) 
   {
      struct stat buf;
      time_t t,now,refresh;
      if(stat(MirrorFile.c_str(), &buf) != 0)
	 return false;
      t = std::max(buf.st_mtime, buf.st_ctime);
      now = time(NULL);
      refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
      if(t + refresh > now)
      {
	 if(Debug)
	    clog << "Mirror file is in RefreshInterval" << endl;
	 DownloadedMirrorFile = true;
	 return true;
      }
      if(Debug)
	 clog << "Mirror file " << MirrorFile << " older than " << refresh << "min, re-download it" << endl;
   }

   // not that great to use pkgAcquire here, but we do not have 
   // any other way right now
   string fetch = BaseUri;
   fetch.replace(0,strlen("mirror://"),"http://");

   pkgAcquire Fetcher;
   new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
   bool res = (Fetcher.Run() == pkgAcquire::Continue);
   if(res)
      DownloadedMirrorFile = true;
   Fetcher.Shutdown();
   return res;
}

bool MirrorMethod::SelectMirror()
{
   // if we do not have a MirrorFile, fallback
   if(!FileExists(MirrorFile))
   {
      // FIXME: fallback to a default mirror here instead 
      //        and provide a config option to define that default
      return _error->Error(_("No mirror file '%s' found "), MirrorFile.c_str());
   }

   // FIXME: make the mirror selection more clever, do not 
   //        just use the first one!
   // BUT: we can not make this random, the mirror has to be
   //      stable accross session, because otherwise we can
   //      get into sync issues (got indexfiles from mirror A,
   //      but packages from mirror B - one might be out of date etc)
   ifstream in(MirrorFile.c_str());
   getline(in, Mirror);
   if(Debug)
      cerr << "Using mirror: " << Mirror << endl;

   UsedMirror = Mirror;
   return true;
}

string MirrorMethod::GetMirrorFileName(string mirror_uri_str)
{
   /* 
    - a mirror_uri_str looks like this:
    mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors/dists/feisty/Release.gpg
   
    - the matching source.list entry
    deb mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors feisty main
   
    - we actually want to go after:
    http://people.ubuntu.com/~mvo/apt/mirror/mirrors

    And we need to save the BaseUri for later:
    - mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors

   FIXME: what if we have two similar prefixes?
     mirror://people.ubuntu.com/~mvo/mirror
     mirror://people.ubuntu.com/~mvo/mirror2
   then mirror_uri_str looks like:
     mirror://people.ubuntu.com/~mvo/apt/mirror/dists/feisty/Release.gpg
     mirror://people.ubuntu.com/~mvo/apt/mirror2/dists/feisty/Release.gpg
   we search sources.list and find:
     mirror://people.ubuntu.com/~mvo/apt/mirror
   in both cases! So we need to apply some domain knowledge here :( and
   check for /dists/ or /Release.gpg as suffixes
   */
   string name;
   if(Debug)
      std::cerr << "GetMirrorFileName: " << mirror_uri_str << std::endl;

   // read sources.list and find match
   vector<metaIndex *>::const_iterator I;
   pkgSourceList list;
   list.ReadMainList();
   for(I=list.begin(); I != list.end(); I++)
   {
      string uristr = (*I)->GetURI();
      if(Debug)
	 std::cerr << "Checking: " << uristr << std::endl;
      if(uristr.substr(0,strlen("mirror://")) != string("mirror://"))
	 continue;
      // find matching uri in sources.list
      if(mirror_uri_str.substr(0,uristr.size()) == uristr)
      {
	 if(Debug)
	    std::cerr << "found BaseURI: " << uristr << std::endl;
	 BaseUri = uristr.substr(0,uristr.size()-1);
      }
   }
   // get new file
   name = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);

   if(Debug) 
   {
      cerr << "base-uri: " << BaseUri << endl;
      cerr << "mirror-file: " << name << endl;
   }
   return name;
}

// MirrorMethod::Fetch - Fetch an item					/*{{{*/
// ---------------------------------------------------------------------
/* This adds an item to the pipeline. We keep the pipeline at a fixed
   depth. */
bool MirrorMethod::Fetch(FetchItem *Itm)
{
   // the http method uses Fetch(0) as a way to update the pipeline,
   // just let it do its work in this case - Fetch() with a valid
   // Itm will always run before the first Fetch(0)
   if(Itm == NULL) 
      return HttpMethod::Fetch(Itm);

   // if we don't have the name of the mirror file on disk yet,
   // calculate it now (can be derived from the uri)
   if(MirrorFile.empty())
      MirrorFile = GetMirrorFileName(Itm->Uri);

  // download mirror file once (if we are after index files)
   if(Itm->IndexFile && !DownloadedMirrorFile)
   {
      Clean(_config->FindDir("Dir::State::mirrors"));
      DownloadMirrorFile(Itm->Uri);
   }

   if(Mirror.empty())
      SelectMirror();

   for (FetchItem *I = Queue; I != 0; I = I->Next)
   {
      if(I->Uri.find("mirror://") != string::npos)
	 I->Uri.replace(0,BaseUri.size(), Mirror);
   }
   
   // now run the real fetcher
   return HttpMethod::Fetch(Itm);
};

void MirrorMethod::Fail(string Err,bool Transient)
{
   if(Queue->Uri.find("http://") != string::npos)
      Queue->Uri.replace(0,Mirror.size(), BaseUri);
   pkgAcqMethod::Fail(Err, Transient);
}

void MirrorMethod::URIStart(FetchResult &Res)
{
   if(Queue->Uri.find("http://") != string::npos)
      Queue->Uri.replace(0,Mirror.size(), BaseUri);
   pkgAcqMethod::URIStart(Res);
}

void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
{
   if(Queue->Uri.find("http://") != string::npos)
      Queue->Uri.replace(0,Mirror.size(), BaseUri);
   pkgAcqMethod::URIDone(Res, Alt);
}


int main()
{
   setlocale(LC_ALL, "");

   MirrorMethod Mth;

   return Mth.Loop();
}
Commit	Line	Data
5f6b130d MV	1	// -- mode: cpp; mode: fold --
	2	// Description /{{{/
	3	// $Id: mirror.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $
	4	/* ######################################################################
	5
	6	Mirror Aquire Method - This is the Mirror aquire method for APT.
	7
	8	##################################################################### */
	9	/}}}/
	10	// Include Files /{{{/
	11	#include <apt-pkg/fileutl.h>
	12	#include <apt-pkg/acquire-method.h>
	13	#include <apt-pkg/acquire-item.h>
	14	#include <apt-pkg/acquire.h>
	15	#include <apt-pkg/error.h>
	16	#include <apt-pkg/hashes.h>
0c312e0e	17	#include <apt-pkg/sourcelist.h>
5f6b130d MV	18
	19	#include <fstream>
	20	#include <iostream>
14e097c1	21	#include <stdarg.h>
d731f9c5	22	#include <sys/stat.h>
70288656 MV	23	#include <sys/types.h>
70288656 MV	24	#include <dirent.h>
14e097c1	25
5f6b130d MV	26	using namespace std;
	27
	28	#include "mirror.h"
	29	#include "http.h"
70288656	30	#include "apti18n.h"
5f6b130d MV	31	/}}}/
5f6b130d MV	32
362d2934	33	/* Done:
59271f62	34	* - works with http (only!)
362d2934 MV	35	* - always picks the first mirror from the list
	36	* - call out to problem reporting script
	37	* - supports "deb mirror://host/path/to/mirror-list/// dist component"
a577a938	38	* - uses pkgAcqMethod::FailReason() to have a string representation
59271f62	39	* of the failure that is also send to LP
362d2934	40	*
86c17f0a	41	* TODO:
d731f9c5 MV	42	* - deal with runing as non-root because we can't write to the lists
d731f9c5 MV	43	dir then -> use the cached mirror file
86c17f0a	44	* - better method to download than having a pkgAcquire interface here
3f599bb7	45	* and better error handling there!
066b53e9	46	* - support more than http
86c17f0a	47	* - testing :)
86c17f0a MV	48	*/
86c17f0a MV	49
5f6b130d	50	MirrorMethod::MirrorMethod()
38eedeb7	51	: HttpMethod(), DownloadedMirrorFile(false)
5f6b130d	52	{
5f6b130d MV	53	};
5f6b130d MV	54
14e097c1 MV	55	// HttpMethod::Configuration - Handle a configuration message /{{{/
	56	// ---------------------------------------------------------------------
	57	/* We stash the desired pipeline depth */
	58	bool MirrorMethod::Configuration(string Message)
	59	{
	60	if (pkgAcqMethod::Configuration(Message) == false)
	61	return false;
	62	Debug = _config->FindB("Debug::Acquire::mirror",false);
	63
	64	return true;
	65	}
	66	/}}}/
	67
d731f9c5	68	// clean the mirrors dir based on ttl information
70288656	69	bool MirrorMethod::Clean(string Dir)
d731f9c5	70	{
0c312e0e MV	71	vector<metaIndex *>::const_iterator I;
	72
	73	if(Debug)
	74	clog << "MirrorMethod::Clean(): " << Dir << endl;
	75
38eedeb7 MV	76	if(Dir == "/")
	77	return _error->Error("will not clean: '/'");
	78
0c312e0e MV	79	// read sources.list
	80	pkgSourceList list;
	81	list.ReadMainList();
70288656 MV	82
	83	DIR *D = opendir(Dir.c_str());
	84	if (D == 0)
	85	return _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
	86
	87	string StartDir = SafeGetCWD();
	88	if (chdir(Dir.c_str()) != 0)
	89	{
	90	closedir(D);
	91	return _error->Errno("chdir",_("Unable to change to %s"),Dir.c_str());
	92	}
	93
	94	for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
	95	{
	96	// Skip some files..
	97	if (strcmp(Dir->d_name,"lock") == 0 \|\|
	98	strcmp(Dir->d_name,"partial") == 0 \|\|
	99	strcmp(Dir->d_name,".") == 0 \|\|
	100	strcmp(Dir->d_name,"..") == 0)
	101	continue;
0c312e0e MV	102
	103	// see if we have that uri
	104	for(I=list.begin(); I != list.end(); I++)
70288656	105	{
0c312e0e MV	106	string uri = (*I)->GetURI();
	107	if(uri.substr(0,strlen("mirror://")) != string("mirror://"))
	108	continue;
066b53e9	109	string BaseUri = uri.substr(0,uri.size()-1);
0c312e0e MV	110	if (URItoFileName(BaseUri) == Dir->d_name)
0c312e0e MV	111	break;
70288656	112	}
0c312e0e MV	113	// nothing found, nuke it
0c312e0e MV	114	if (I == list.end())
70288656	115	unlink(Dir->d_name);
70288656	116	};
d731f9c5	117
70288656 MV	118	chdir(StartDir.c_str());
	119	closedir(D);
	120	return true;
d731f9c5 MV	121	}
d731f9c5 MV	122
14e097c1	123
38eedeb7 MV	124	bool MirrorMethod::DownloadMirrorFile(string mirror_uri_str)
	125	{
	126
	127	// check the file, if it is not older than RefreshInterval just use it
	128	// otherwise try to get a new one
	129	if(FileExists(MirrorFile))
	130	{
	131	struct stat buf;
	132	time_t t,now,refresh;
	133	if(stat(MirrorFile.c_str(), &buf) != 0)
	134	return false;
	135	t = std::max(buf.st_mtime, buf.st_ctime);
	136	now = time(NULL);
	137	refresh = 60*_config->FindI("Acquire::Mirror::RefreshInterval",360);
	138	if(t + refresh > now)
	139	{
	140	if(Debug)
	141	clog << "Mirror file is in RefreshInterval" << endl;
	142	DownloadedMirrorFile = true;
	143	return true;
	144	}
	145	if(Debug)
	146	clog << "Mirror file " << MirrorFile << " older than " << refresh << "min, re-download it" << endl;
	147	}
	148
	149	// not that great to use pkgAcquire here, but we do not have
	150	// any other way right now
	151	string fetch = BaseUri;
	152	fetch.replace(0,strlen("mirror://"),"http://");
	153
	154	pkgAcquire Fetcher;
	155	new pkgAcqFile(&Fetcher, fetch, "", 0, "", "", "", MirrorFile);
	156	bool res = (Fetcher.Run() == pkgAcquire::Continue);
	157	if(res)
	158	DownloadedMirrorFile = true;
	159	Fetcher.Shutdown();
	160	return res;
	161	}
	162
	163	bool MirrorMethod::SelectMirror()
	164	{
	165	// if we do not have a MirrorFile, fallback
	166	if(!FileExists(MirrorFile))
	167	{
	168	// FIXME: fallback to a default mirror here instead
	169	// and provide a config option to define that default
	170	return _error->Error(_("No mirror file '%s' found "), MirrorFile.c_str());
	171	}
	172
	173	// FIXME: make the mirror selection more clever, do not
	174	// just use the first one!
	175	// BUT: we can not make this random, the mirror has to be
	176	// stable accross session, because otherwise we can
	177	// get into sync issues (got indexfiles from mirror A,
	178	// but packages from mirror B - one might be out of date etc)
	179	ifstream in(MirrorFile.c_str());
	180	getline(in, Mirror);
	181	if(Debug)
	182	cerr << "Using mirror: " << Mirror << endl;
	183
	184	UsedMirror = Mirror;
	185	return true;
	186	}
	187
188	string MirrorMethod::GetMirrorFileName(string mirror_uri_str)
5f6b130d	189	{
066b53e9 MV	190	/*
	191	- a mirror_uri_str looks like this:
	192	mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors/dists/feisty/Release.gpg
	193
	194	- the matching source.list entry
	195	deb mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors feisty main
	196
	197	- we actually want to go after:
	198	http://people.ubuntu.com/~mvo/apt/mirror/mirrors
	199
	200	And we need to save the BaseUri for later:
	201	- mirror://people.ubuntu.com/~mvo/apt/mirror/mirrors
	202
	203	FIXME: what if we have two similar prefixes?
	204	mirror://people.ubuntu.com/~mvo/mirror
	205	mirror://people.ubuntu.com/~mvo/mirror2
	206	then mirror_uri_str looks like:
	207	mirror://people.ubuntu.com/~mvo/apt/mirror/dists/feisty/Release.gpg
	208	mirror://people.ubuntu.com/~mvo/apt/mirror2/dists/feisty/Release.gpg
	209	we search sources.list and find:
	210	mirror://people.ubuntu.com/~mvo/apt/mirror
	211	in both cases! So we need to apply some domain knowledge here :( and
	212	check for /dists/ or /Release.gpg as suffixes
	213	*/
38eedeb7	214	string name;
f0b509cd	215	if(Debug)
38eedeb7	216	std::cerr << "GetMirrorFileName: " << mirror_uri_str << std::endl;
066b53e9 MV	217
	218	// read sources.list and find match
	219	vector<metaIndex *>::const_iterator I;
	220	pkgSourceList list;
	221	list.ReadMainList();
	222	for(I=list.begin(); I != list.end(); I++)
	223	{
	224	string uristr = (*I)->GetURI();
f0b509cd MV	225	if(Debug)
f0b509cd MV	226	std::cerr << "Checking: " << uristr << std::endl;
066b53e9 MV	227	if(uristr.substr(0,strlen("mirror://")) != string("mirror://"))
	228	continue;
	229	// find matching uri in sources.list
	230	if(mirror_uri_str.substr(0,uristr.size()) == uristr)
	231	{
f0b509cd MV	232	if(Debug)
f0b509cd MV	233	std::cerr << "found BaseURI: " << uristr << std::endl;
066b53e9 MV	234	BaseUri = uristr.substr(0,uristr.size()-1);
	235	}
	236	}
70288656	237	// get new file
38eedeb7	238	name = _config->FindDir("Dir::State::mirrors") + URItoFileName(BaseUri);
5f6b130d	239
14e097c1 MV	240	if(Debug)
	241	{
	242	cerr << "base-uri: " << BaseUri << endl;
38eedeb7	243	cerr << "mirror-file: " << name << endl;
d731f9c5	244	}
38eedeb7	245	return name;
5f6b130d MV	246	}
	247
	248	// MirrorMethod::Fetch - Fetch an item /{{{/
	249	// ---------------------------------------------------------------------
	250	/* This adds an item to the pipeline. We keep the pipeline at a fixed
	251	depth. */
	252	bool MirrorMethod::Fetch(FetchItem *Itm)
	253	{
38eedeb7 MV	254	// the http method uses Fetch(0) as a way to update the pipeline,
	255	// just let it do its work in this case - Fetch() with a valid
	256	// Itm will always run before the first Fetch(0)
	257	if(Itm == NULL)
	258	return HttpMethod::Fetch(Itm);
	259
	260	// if we don't have the name of the mirror file on disk yet,
	261	// calculate it now (can be derived from the uri)
	262	if(MirrorFile.empty())
	263	MirrorFile = GetMirrorFileName(Itm->Uri);
	264
	265	// download mirror file once (if we are after index files)
	266	if(Itm->IndexFile && !DownloadedMirrorFile)
5f6b130d	267	{
70288656	268	Clean(_config->FindDir("Dir::State::mirrors"));
38eedeb7	269	DownloadMirrorFile(Itm->Uri);
5f6b130d MV	270	}
5f6b130d MV	271
38eedeb7 MV	272	if(Mirror.empty())
	273	SelectMirror();
	274
ef1e6d88 MV	275	for (FetchItem *I = Queue; I != 0; I = I->Next)
	276	{
	277	if(I->Uri.find("mirror://") != string::npos)
38eedeb7	278	I->Uri.replace(0,BaseUri.size(), Mirror);
ef1e6d88	279	}
38eedeb7	280
14e097c1 MV	281	// now run the real fetcher
14e097c1 MV	282	return HttpMethod::Fetch(Itm);
5f6b130d MV	283	};
5f6b130d MV	284
14e097c1 MV	285	void MirrorMethod::Fail(string Err,bool Transient)
	286	{
	287	if(Queue->Uri.find("http://") != string::npos)
	288	Queue->Uri.replace(0,Mirror.size(), BaseUri);
	289	pkgAcqMethod::Fail(Err, Transient);
	290	}
	291
	292	void MirrorMethod::URIStart(FetchResult &Res)
	293	{
	294	if(Queue->Uri.find("http://") != string::npos)
	295	Queue->Uri.replace(0,Mirror.size(), BaseUri);
	296	pkgAcqMethod::URIStart(Res);
	297	}
	298
	299	void MirrorMethod::URIDone(FetchResult &Res,FetchResult *Alt)
	300	{
	301	if(Queue->Uri.find("http://") != string::npos)
	302	Queue->Uri.replace(0,Mirror.size(), BaseUri);
	303	pkgAcqMethod::URIDone(Res, Alt);
	304	}
	305
	306
5f6b130d MV	307	int main()
	308	{
	309	setlocale(LC_ALL, "");
	310
	311	MirrorMethod Mth;
	312
14e097c1	313	return Mth.Loop();
5f6b130d MV	314	}
	315
	316